Question: Which attack had the largest number of perpetrators?
Paraphrase: What attack had the most attackers?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q81672 . ?ent wdt:P3886 ?obj } ORDER BY DESC(?obj)LIMIT 5 
Answer: Lillehammer affair, 1980 Turkish Consulate attack in Lyon, 2017 shooting of Paris police officers, assassination attempt on Prince Alfred 1868, Bayonne mosque shooting